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0.5 dB LSB 6-Bit Digital Attenuator Chip, DC - 13 GHz

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Data Sheet
Application Notes

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• 0.5 dB LSB Steps to 31.5 dB
• Single Control Line Per Bit
• ±0.5 dB Typical Bit Error
• Die Size: 0.85 x 1.45 x 0.1 mm

Typical Applications

• Fiber Optics & Broadband Telecom
• Microwave Radio & VSAT
• Military Radios, Radar, & ECM
• Space Applications

Functional Diagram

HMC424 Functional Diagram

General Description

The HMC424 die is a broadband 6-bit GaAs IC digital attenuator MMIC chip. Covering DC to 13 GHz, the insertion loss is less then 4 dB typical. The attenuator bit values are 0.5 (LSB), 1, 2, 4, 8, and 16 dB for a total attenuation of 31.5 dB. Attenuation accuracy is excellent at ±0.5 dB typical step error with an IIP3 of +32 dBm. Six control voltage inputs, toggled between 0 and -5V, are used to select each attenuation state. A single Vee bias of -5V allows operation at frequencies down to DC.